@media  screen and (max-width: 600px) {
    article {
        height: 1750px;
    }
    table {
    width: 280px;
    height: 280px;
    }
    th {
    font-size: 13px;
    }
    td {
    font-size: 12px;
    }
    #footer {
        margin-top: 50px;
    }
}

@media screen and (min-width: 600px) and (max-width: 768px) {
    article {
        height: 1700px;
    }
    table {
        width: 500px;
        height: 500px;
    }
    th {
    font-size: 20px;
    }
    td {
    font-size: 18px;
    }
    #footer {
    margin-top: 50px;
    }
}

@media screen and (min-width: 768px) and (max-width: 992px) {
    article {
        height: 1500px;
    }
    table {
        width: 500px;
        height: 500px;
    }
    th {
    font-size: 20px;
    }
    td {
    font-size: 18px;
    }
    #footer {
    margin-top: 500px;
    }
}

@media screen and (min-width:  992px) and (max-width: 1200px) {
    article {
        height: 1250px;
    }
    table {
        width: 500px;
        height: 500px;
    }
    th {
    font-size: 20px;
    }
    td {
    font-size: 18px;
    }
    #footer {
    margin-top: 50px;
    }
 }

@media screen and (min-width: 1200px) {
    article {
        height: 600px;
    }
    table {
        width: 500px;
        height: 500px;
    }
    table {
        width: 500px;
        height: 500px;
    }
    th {
    font-size: 20px;
    }
    td {
    font-size: 18px;
    }
    #footer {
    margin-top: 50px;
    }
}
/* Einde mediaquerry. */

main {
    max-width: 1200px;
    margin: 25px auto;
}

h1, h2 {
    font-family: Arial, Helvetica, sans-serif;
}

table {
        float: left;
        margin: 25px 25px 25px 0px;
        border: 1px solid black;
        border-collapse: collapse;
}

.titel-section {
    margin-top: 25px;
    background-color: #253c70;
    padding: 5px;
    font-size: larger;
    color: white;
}

p {
    font-family: Arial, Helvetica, sans-serif;
    font-size: 18px;
}

.sidebar-nav {
    width: 300px;
    height: 575px;
    float: left;
    margin: 0px 25px 0px 0px;
    overflow-y: scroll;
}

.sidebar-nav a {
    padding: 10px;
    font-family: Arial, Helvetica, sans-serif;
    text-decoration: none;
    color: black;
    display: block;
}

.sidebar-nav a:hover {
    background-color: #253c70;
    color: white;
}

th {
    font-family: Arial, Helvetica, sans-serif;
}

td {
    font-family: Arial, Helvetica, sans-serif;
    padding: 5px 10px;
    text-align: center;
    border: 1px solid black;
} 

.sidebar-nav-rechts {
    width: 300px;
    height: 600px;
    float: left;
    margin: 0px 25px 0px 0px;
    font-family: Arial, Helvetica, sans-serif;
    font-size: 18px;
}

.bekijk-de-oplossing {
    font-family: Arial, Helvetica, sans-serif;
    font-size: 18px;
    font-weight: bold;
    background-color: purple;
    color: white; 
    padding: 5px;
}

.bekijk-de-oplossing span {
    float: right; 
    margin-right: 10px;
}